Global Patent Index - EP 0914882 A1

EP 0914882 A1 19990512 - Process for preparing molding sand for green sand mold

Title (en)

Process for preparing molding sand for green sand mold

Title (de)

Verfahren zur Herstellung von Giessereisand für Nassgusformen

Title (fr)

Procédé de préparation du sable de moulage pour des moules au sable vert

Publication

EP 0914882 A1 19990512 (EN)

Application

EP 98119135 A 19981009

Priority

JP 29335397 A 19971009

Abstract (en)

A process for preparing a molding sand for a green sand mold is provided. The process comprises the step of drying under a reduced pressure of 0 to 0.3 atm for 0.5 to 30 seconds a green molding sand obtained by kneading silica sand, clay, and water, to dry the clay superficial part and to retain in a moist state the clay deeper part on the silica sand core part in each particle of the molding sand. The molding sand prepared by this process has enhanced flowability. Furthermore, the sand mold prepared from the molding sand has sufficient strength. <IMAGE>

IPC 1-7

B22C 1/00; B22C 5/08

IPC 8 full level

B22C 5/04 (2006.01); B22C 1/00 (2006.01); B22C 5/08 (2006.01)

CPC (source: EP US)

B22C 1/00 (2013.01 - EP US); B22C 5/08 (2013.01 - EP US)

Citation (search report)

  • [A] EP 0736349 A2 19961009 - EIRICH MASCHF GUSTAV [DE]
  • [PX] DATABASE WPI Section Ch Week 9850, Derwent World Patents Index; Class M22, AN 98-588205, XP002091458
  • [A] RADHAKRISHNAN A ET AL: "EFFECT OF WATER-CLAY RATIO AND BENTONITE CONTENT ON THE FLOWABILITY OF SYNTHETIC SANDS", BR FOUNDRYMAN AUG 1975, vol. 68, no. part 8, August 1975 (1975-08-01), pages 202 - 208, XP002091487
  • [A] SUBBA RAO V V ET AL: "EFFECT OF CLAY-WATER RATIO AND CLAY CONTENT ON THE PHYSICAL PROPERTIES OF BENTONITE BONDED HOMOGENEOUS SAND MIXES", BR FOUNDRYMAN MAR 1976, vol. 69, no. part 3, March 1976 (1976-03-01), pages 71 - 77, XP002091488
  • [A] HOFMANN ET AL: "Statistical Evaluation of 200 Different Foundry Sands", AMERICAN FOUNDRYMEN'S SOCIETY TRANSACTIONS, vol. 80, no. 8, - 1980, pages 177 - 186, XP002091489
  • [A] ANONYMOUS: "Effect of Water in Green Sand Mixtures", MODERN CASTING, vol. 72, no. 7, July 1982 (1982-07-01), pages 44, XP002091490
  • [A] BLATZ J: "COOLING OF MOULDING SAND UNDER VACUUM", FOUNDRY TRADE JOURNAL, vol. 166, no. 3447, 7 February 1992 (1992-02-07), pages 64, XP000249509

Designated contracting state (EPC)

CH DE LI

DOCDB simple family (publication)

EP 0914882 A1 19990512; CN 1214282 A 19990421; JP 3582690 B2 20041027; JP H11114654 A 19990427; US 6017387 A 20000125

DOCDB simple family (application)

EP 98119135 A 19981009; CN 98121306 A 19981009; JP 29335397 A 19971009; US 16916598 A 19981008